Bore, stroke, displacement and compression for all 3 Hyundai Delta engines, compared side by side. Plus rod ratio and head specs where published.
| Displacement | 152.6–164.8 ci |
|---|---|
| Cylinders | 6 |
| Bore | 3.189–3.413" |
| Stroke | 2.953–3.150" |
| Compression | 10.0:1 |
| Advertised power | 170–173 hp |
| Engine | Displacement | Bore × Stroke | CR | HP |
|---|---|---|---|---|
| G6BA | 164.8 ci | 3.4134" × 2.9528" | 10:1 | 173 |
| G6BA | 162.1 ci | 3.4134" × 2.9528" | 10:1 | 172 |
| 25 | 152.6 ci | 3.189" × 3.1496" | 10:1 | 170 |
Both bore and stroke vary across the family, so these are separate castings rather than variations on one block.
2 of 3 are oversquare — bore larger than stroke, which favours revs over low-end torque.
Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.